Buy-to-let landlords with properties holding five or more tenants have been freed from the prospect of paying license fees after the Home Energy Conservation Bill was scrapped.
But the MP behind the proposals says legislation may still be in the pipeline.
Despite the Bill being aimed primarily at reducing energy usage in houses of multiple occupancy (HMOs), plans for local authorities to register landlords and administer annual license fees were attached.
Labour MP Dr Des Turner withdrew his proposal in July after government legal advisers raised concerns.
But the advisers' objections were not made to the clauses concerning HMO licensing, and now Dr Turner says progress is likely to be made at a later date.